KR102493488B1 - Display device - Google Patents

Abstract

The display device of the present invention includes a first pixel, a second pixel, and a third pixel, the third pixel is positioned in a first direction from the first pixel and the second pixel, and the first pixel is the first pixel. a first dot located in a second direction from two pixels; a second dot adjacent to the first dot in the first direction; a third dot adjacent to the first dot in a direction opposite to the first direction; a timing controller configured to receive grayscale values of the first to third dots of an image frame from an external processor; When the first dot is determined as an edge of an object included in the image frame based on the grayscale values of the first to third dots, the first grayscale value corresponding to the first pixel and the first grayscale value corresponding to the second pixel a grayscale correction unit that generates a first and second corrected grayscale value based on the second grayscale value; and supplying a first data voltage corresponding to the first corrected grayscale value to the first pixel, supplying a second data voltage corresponding to the second corrected grayscale value to the second pixel, and supplying a third grayscale value to the second pixel. and a data driver supplying a corresponding third data voltage to the third pixel.

Description

Display device {DISPLAY DEVICE}

The present invention relates to a display device.

As information technology develops, the importance of a display device as a connection medium between a user and information is being highlighted. In response to this, the use of display devices such as a liquid crystal display device, an organic light emitting display device, and a plasma display device is increasing.

The display device writes a data voltage corresponding to each pixel and causes each pixel to emit light. Each pixel emits light with a luminance corresponding to the written data voltage.

Adjacent pixels of different single colors may be grouped, and a unit of such a group may be defined as a dot. Each dot can express more diverse colors by combining single colors. A picture, text, etc. of an image frame may be expressed in units of dots.

However, since a dot has a larger size than a pixel, aliasing may be recognized by a user in a picture, text, etc. of an image frame expressed in dot units.

A technical problem to be solved is to provide a display device capable of displaying image frames with aliasing reduced in various pixel arrangement structures.

A display device according to an exemplary embodiment of the present invention includes a first pixel, a second pixel, and a third pixel, wherein the third pixel is positioned in a first direction from the first pixel and the second pixel; The first pixel may include a first dot located in a second direction from the second pixel; a second dot adjacent to the first dot in the first direction; a third dot adjacent to the first dot in a direction opposite to the first direction; a timing controller configured to receive grayscale values of the first to third dots of an image frame from an external processor; When the first dot is determined as an edge of an object included in the image frame based on the grayscale values of the first to third dots, the first grayscale value corresponding to the first pixel and the first grayscale value corresponding to the second pixel a grayscale correction unit that generates a first and second corrected grayscale value based on the second grayscale value; and supplying a first data voltage corresponding to the first corrected grayscale value to the first pixel, supplying a second data voltage corresponding to the second corrected grayscale value to the second pixel, and supplying a third grayscale value to the second pixel. and a data driver supplying a corresponding third data voltage to the third pixel.

The grayscale compensator may include a first dot detector outputting a first detection signal when an edge value of the first dot calculated based on the grayscale values of the first to third dots is greater than or equal to a threshold value.

When the first detection signal is input, the grayscale corrector converts the first grayscale value into the first corrected grayscale value, converts the second grayscale value into the second corrected grayscale value, and converts the first corrected grayscale value into the first corrected grayscale value. The display device may further include a first dot converter having the same grayscale value as the second corrected grayscale value.

The first dot converter may set an average value of the first grayscale value and the second grayscale value as the first corrected grayscale value and the second corrected grayscale value.

For the same grayscale value, the luminance of the first pixel is lower than the luminance of the second pixel, and the first dot conversion unit applies a first weight value to the first grayscale value and a second weight value to the second grayscale value. Values to which is applied are summed to set the first and second corrected grayscale values, and the first weight may be smaller than the second weight.

For the same grayscale value, the luminance of the first pixel is higher than the luminance of the second pixel, and the first dot conversion unit applies a first weight value to the first grayscale value and a second weight value to the second grayscale value. Values to which is applied are summed to set the first corrected grayscale value and the second corrected grayscale value, and the first weight may be greater than the second weight.

The display device includes a fourth pixel, a fifth pixel, and a sixth pixel, the sixth pixel is positioned in a first direction from the fourth pixel and the fifth pixel, and the fourth pixel is the fifth pixel. a fourth dot located in a second direction from; a fifth dot adjacent to the fourth dot in the second direction; and a sixth dot adjacent to the fourth dot in a direction opposite to the second direction, wherein the timing controller receives grayscale values of the fourth to sixth dots of the image frame from the processor; , The gray level corrector outputs a second detection signal when the fourth dot is determined as a dot adjacent to an edge of an object included in the image frame based on the gray level values of the fourth to sixth dots. A dot detector may be further included.

When the second detection signal is input, the grayscale corrector selects one of a fourth grayscale value corresponding to the fourth pixel and a fifth grayscale value corresponding to the fifth pixel based on the second detection signal. and a second dot converter configured to generate a third corrected grayscale value by decreasing the selected grayscale value.

When the second dot converter generates the third corrected grayscale value by decreasing the fourth grayscale value, the data driver may supply a data voltage corresponding to the third corrected grayscale value to the fourth pixel.

When the second dot converter generates the third corrected grayscale value by decreasing the fifth grayscale value, the data driver may supply a data voltage corresponding to the third corrected grayscale value to the fifth pixel.

When the first dot constitutes an edge dot of a letter in the image frame, the processor determines that the first to third grayscale values are different from each other, and the second grayscale value is the first grayscale value and the first grayscale value. The first to third grayscale values may be provided so as to be between the three grayscale values.

The first dot detector may calculate an edge value of the first dot by applying a prewitt mask of a single row having the first direction as a row direction to the first to third dots.

The first dot detector calculates an edge value of the first dot using a plurality of rows of prewit masks or Sobel masks having the first direction as a row direction and the second direction as a column direction. can

When the first detection signal is input, the grayscale corrector converts the first grayscale value into the first corrected grayscale value, converts the second grayscale value into the second corrected grayscale value, and converts the first grayscale value into the first corrected grayscale value. The display device may further include a first dot converter in which a sum of the value and the second grayscale value is equal to a sum of the first corrected grayscale value and the second corrected grayscale value.

For the same grayscale values, the luminance of the first pixel may be lower than the luminance of the second pixel, and the first corrected grayscale value may be higher than the second corrected grayscale value.

For the same grayscale values, the luminance of the second pixel may be lower than the luminance of the first pixel, and the second corrected grayscale value may be higher than the first corrected grayscale value.

A luminance of the first pixel corresponding to the first data voltage and a luminance of the second pixel corresponding to the second data voltage may be equal to each other.

A display device according to an exemplary embodiment of the present invention includes a first pixel, a second pixel, and a third pixel, the first pixel is positioned in a first direction from the second pixel, and The second pixel may include a first dot located in a second direction from the third pixel; a second dot adjacent to the first dot in the first direction; a third dot adjacent to the first dot in a direction opposite to the first direction; a timing controller configured to receive grayscale values of the first to third dots of an image frame from an external processor; When the first dot is determined as an edge of an object included in the image frame based on the grayscale values of the first to third dots, the first grayscale value corresponding to the first pixel and the first grayscale value corresponding to the second pixel a grayscale correction unit that generates a first and second corrected grayscale value based on the second grayscale value; and supplying a first data voltage corresponding to the first corrected grayscale value to the first pixel, supplying a second data voltage corresponding to the second corrected grayscale value to the second pixel, and supplying a third grayscale value to the second pixel. A data driver supplying a corresponding third data voltage to the third pixel may be included.

The grayscale compensator may include a first dot detector outputting a first detection signal when an edge value of the first dot calculated based on the grayscale values of the first to third dots is greater than or equal to a threshold value.

When the first detection signal is input, the grayscale corrector converts the first grayscale value into the first corrected grayscale value, converts the second grayscale value into the second corrected grayscale value, and converts the first corrected grayscale value into the first corrected grayscale value. The display device may further include a first dot converter having the same grayscale value as the second corrected grayscale value.

A display device according to an exemplary embodiment includes a seventh pixel, an eighth pixel, and a ninth pixel, wherein the ninth pixel is positioned in a first direction from the seventh pixel and the eighth pixel; A seventh pixel is located in a second direction from the eighth pixel, a seventh dot; Adjacent to the seventh dot in the first direction, including a tenth pixel, an eleventh pixel, and a twelfth pixel, wherein the twelfth pixel is located in a first direction from the tenth pixel and the eleventh pixel, The tenth pixel may include an eighth dot located in a second direction from the eleventh pixel; It is adjacent to the seventh dot in a direction opposite to the second direction, and includes a thirteenth pixel, a fourteenth pixel, and a fifteenth pixel, wherein the fifteenth pixel extends from the thirteenth pixel and the fourteenth pixel in a first direction. , wherein the thirteenth pixel is located in a second direction from the fourteenth pixel, a ninth dot; Adjacent to the ninth dot in the first direction, including a sixteenth pixel, a seventeenth pixel, and an eighteenth pixel, wherein the eighteenth pixel is located in a first direction from the sixteenth pixel and the seventeenth pixel, The 16th pixel may include a 10th dot located in a second direction from the 17th pixel; a timing controller configured to receive grayscale values of the ninth to tenth dots of an image frame from an external processor; A fourth correction grayscale value is generated based on grayscale values of the seventh pixel, the tenth pixel, the thirteenth pixel, and the sixteenth pixel, and the eighth pixel, the eleventh pixel, the fourteenth pixel, and generating a fifth correction grayscale value based on the grayscale values of the seventeenth pixel, and generating a sixth correction grayscale value based on the grayscale values of the ninth pixel, the twelfth pixel, the fifteenth pixel, and the eighteenth pixel. a gradation correction unit that generates a value; and supplies a data voltage corresponding to the fourth corrected grayscale value to the seventh pixel, supplies a data voltage corresponding to the fifth corrected grayscale value to the eighth pixel, and supplies data voltage corresponding to a sixth corrected grayscale value. and a data driver supplying a voltage to the ninth pixel.

In generating the fourth corrected grayscale value, a weight for the grayscale value of the seventh pixel among grayscale values of the seventh pixel, the tenth pixel, the thirteenth pixel, and the sixteenth pixel is the largest, In generating the fifth corrected grayscale value, the weight of the grayscale value of the eighth pixel among the grayscale values of the eighth pixel, the eleventh pixel, the fourteenth pixel, and the seventeenth pixel is the greatest, and the In generating the 6 correction grayscale values, the grayscale value of the ninth pixel may have the greatest weight among the grayscale values of the ninth pixel, the twelfth pixel, the fifteenth pixel, and the eighteenth pixel.

A sum of the weight for the seventh dot, the weight for the eighth dot, the weight for the ninth dot, and the weight for the tenth dot may be 1.

The weight for the seventh dot is 0.5 or more and 0.75 or less, the weight for the eighth dot is 0.1 or more and 0.15 or less, the weight for the ninth dot is 0.1 or more and 0.15 or less, and the 10th dot has a weight of 0.1 or more and 0.15 or less. The weight for may be a value of 0.1 or more and 0.15 or less.

The weight of the seventh dot may be 0.625, the weight of the eighth dot may be 0.125, the weight of the ninth dot may be 0.125, and the weight of the tenth dot may be 0.125.

The display device according to the present invention can display image frames with aliasing reduced for various pixel arrangement structures.

1 is a diagram for explaining a display device according to an exemplary embodiment of the present invention.
FIG. 2 is a diagram for explaining a pixel according to the exemplary embodiment of FIG. 1 .
FIG. 3 is a diagram for explaining a method of driving a pixel of FIG. 2 .
4 is a diagram for explaining a display device according to another exemplary embodiment of the present invention.
FIG. 5 is a diagram for explaining a pixel according to the exemplary embodiment of FIG. 4 .
FIG. 6 is a diagram for explaining a method of driving the pixels of FIG. 5 .
7 is a diagram for explaining a first image frame to which anti-aliasing is not applied, displayed in an RGB-stripe structure.
8 is a diagram for explaining a second image frame to which anti-aliasing is applied, displayed in an RGB-stripe structure.
FIG. 9 is an enlarged view of first to third dots of FIG. 8 .
10 is a diagram for explaining a case in which a second image frame is displayed without correction in an S-stripe structure.
11 is a diagram for explaining a gray level compensator according to a first embodiment of the present invention.
FIG. 12 is a diagram for explaining a third image frame in which the second image frame is corrected by the gradation compensator of the first embodiment.
FIG. 13 is a diagram for explaining a third image frame in which the second image frame is differently corrected by the gradation corrector according to the first embodiment.
FIG. 14 is an enlarged view of fourth to sixth dots of FIG. 8 .
15 is a diagram for explaining a case in which a second image frame is displayed without correction in an S-stripe structure.
16 is a diagram for explaining a gray level compensator according to the second embodiment of the present invention.
FIG. 17 is a diagram for explaining a fourth image frame in which the second image frame is corrected by the gradation corrector according to the second embodiment.
18 is a diagram for explaining a gray level compensator according to a third embodiment of the present invention.
FIG. 19 is an enlarged view of seventh to tenth dots of FIG. 8 .
20 is a diagram for explaining a case in which a second image frame is displayed without correction in an S-stripe structure.
21 is a diagram for explaining a gray level compensator according to a fourth embodiment of the present invention.
22 is a diagram for explaining a fifth image frame in which the second image frame is partially corrected by the gradation corrector according to the fourth embodiment.
FIG. 23 is a diagram for explaining a case in which embodiments of the present invention are applied to an S-stripe structure different from those of FIGS. 1 and 4 .

Hereinafter, various embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art can easily carry out the present invention. The present invention may be embodied in many different forms and is not limited to the embodiments set forth herein.

In order to clearly describe the present invention, parts irrelevant to the description are omitted, and the same reference numerals are assigned to the same or similar components throughout the specification. Therefore, the reference numerals described above can be used in other drawings as well.

In addition, since the size and thickness of each component shown in the drawings are arbitrarily shown for convenience of explanation, the present invention is not necessarily limited to the shown bar. In the drawing, the thickness may be exaggerated to clearly express various layers and regions.

1 is a diagram for explaining a display device according to an exemplary embodiment of the present invention.

Referring to FIG. 1 , a display device 10 according to an exemplary embodiment of the present invention includes a timing controller 11, a data driver 12, a scan driver 13, a pixel unit 14, and a grayscale corrector 15. ) may be included.

Processor 9 may be a general-purpose processing unit. For example, the processor 9 may be an application processor (AP), central processing unit (CPU), graphics processing unit (GPU), micro controller unit (MCU), or other host system.

The processor 9 may provide the timing controller 11 with control signals necessary for displaying an image frame and grayscale values for each pixel. The control signals may include, for example, a data enable signal, a vertical synchronization signal, a horizontal synchronization signal, a target maximum luminance, and the like. .

The timing controller 11 may provide a clock signal, a scan start signal, and the like to the scan driver 13 to conform to the specifications of the scan driver 13 based on the received control signals. In addition, the timing controller 11 may provide modified or maintained grayscale values and control signals to the data driver 12 to conform to the specifications of the data driver 12 based on the received grayscale values and control signals.

The data driver 12 may generate data voltages to be provided to the data lines D1 , D2 , D3 , ..., Dn using the grayscale values and control signals received from the timing controller 11 . For example, data voltages generated in units of pixel rows may be simultaneously applied to the data lines D1 to Dn according to an output control signal included in the control signal.

The scan driver 13 may receive control signals such as a clock signal and a scan start signal from the timing controller 11 and generate scan signals to be provided to the scan lines S1, S2, S3, ..., Sm. there is. For example, the scan driver 13 may sequentially provide turn-on level scan signals to the scan lines S1 to Sn. For example, the scan driver 13 may be configured in the form of a shift register, and may generate scan signals in a manner of sequentially transferring a scan start signal to a next stage circuit under the control of a clock signal. .

The pixel unit 14 includes pixels (..., PX1, PX2, PX3, ...). Each of the pixels (..., PX1, PX2, PX3, ...) may be connected to a corresponding data line and scan line. For example, when data voltages for one pixel row are applied from the data driver 12 to the data lines D1 to Dn, an image positioned on a scan line receiving a turn-on level scan signal from the scan driver 13 Data voltages may be written to the action. This driving method will be described in more detail with reference to FIGS. 2 and 3 .

Each of the pixels (..., PX1, PX2, PX3, ...) may emit light in a single color. For example, the first pixel PX1 may emit light of a first color C1, the second pixel PX2 may emit light of a second color C2, and the third pixel PX3 may emit light of a second color C2. It can emit light in 3 colors (C3). The color of each pixel may be determined by the size of a bandgap of an organic material of the organic light emitting diode OLED1 of FIG. 2 to be described later. The first to third colors C1 , C2 , and C3 may be set in various ways according to the design of the display device 10 . For example, the first to third colors C1 , C2 , and C3 may correspond to red, green, and blue, respectively. Also, the first to third colors C1 , C2 , and C3 may correspond to green, red, and blue, respectively. Also, the first to third colors C1 , C2 , and C3 may correspond to green, blue, and red, respectively. Also, the first to third colors C1 , C2 , and C3 may correspond to blue, green, and red, respectively. Also, the first to third colors C1 , C2 , and C3 may correspond to red, blue, and green, respectively. Also, the first to third colors C1 , C2 , and C3 may correspond to blue, red, and green, respectively. In another embodiment, the first to third colors C1, C2, and C3 may selectively correspond to cyan, magenta, and yellow.

The third pixel PX3 is positioned in the first direction DR1 from the first and second pixels PX1 and PX2, and the first pixel PX1 moves in the second direction DR2 from the second pixel PX2. can be located in Hereinafter, the positions of the pixels PX1 , PX2 , and PX3 will be described based on the emission areas of the pixels PX1 , PX2 , and PX3 . Circuit regions of the pixels PX1 , PX2 , and PX3 may not coincide with corresponding light emitting regions.

The first dot DT1 may be defined as a group of the first pixel PX1 , the second pixel PX2 , and the third pixel PX3 . Such a pixel arrangement structure may be named as an S-stripe structure. Unlike the RGB-stripe structure described later, the S-stripe structure has an advantage in securing an aperture ratio of a fine metal mask (FMM) used in a deposition process of an organic light emitting diode. That is, a wider interval between pixels of the same color may be secured.

When the first dot DT1 is determined to be an edge of an object included in the image frame, the grayscale corrector 15 determines the first grayscale value and the second grayscale value for the first pixel PX1 and the second pixel PX2. Based on the value, a first correction grayscale value and a second correction grayscale value may be generated. At this time, the timing controller 11 provides a first correction grayscale value for the first pixel PX1 , provides a second correction grayscale value for the second pixel PX2 , and provides a second correction grayscale value for the third pixel PX3 . An uncorrected third grayscale value may be provided. Accordingly, the data driver 12 supplies the first data voltage corresponding to the first corrected grayscale value to the first pixel PX1 and supplies the second data voltage corresponding to the second corrected grayscale value to the second pixel PX2. and a third data voltage corresponding to a third grayscale value may be supplied to the third pixel PX3 . A specific embodiment of the gray level compensator 15 will be described later with reference to FIGS. 11 to 18 .

In one embodiment, the gray level compensator 15 and the timing controller 11 may exist as independent individual chips. In another embodiment, the gray level compensator 15 and the timing control unit 11 may exist as an integral single chip. For example, the gray level correction unit 15 and the timing controller 11 may be integrated and exist as a single IC (integrated circuit).

Hereinafter, the display device 10 will be described based on an organic light emitting display device, but those skilled in the art will know that the display device 10 of the present application can also be applied to a liquid crystal display device if the pixel circuit structure of FIGS. 2 and 3 is replaced. You will understand.

FIG. 2 is a diagram for explaining a pixel according to the exemplary embodiment of FIG. 1 , and FIG. 3 is a diagram for explaining a method of driving the pixel of FIG. 2 .

Referring to FIG. 2 , a circuit structure of an exemplary pixel PXij is shown.

It is assumed that the pixel PXij is connected to an arbitrary i-th scan line and a j-th data line. The first to third pixels PX1 , PX2 , and PX3 may have a circuit structure of a pixel PXij.

The pixel PXij may include a plurality of transistors T1 and T2, a storage capacitor Cst1, and an organic light emitting diode OLED1. In this embodiment, the transistors T1 and T2 are shown as P-type transistors, but those skilled in the art can construct a pixel circuit having the same function as an N-type transistor.

The gate electrode of the transistor T2 is connected to the scan line Si, one electrode is connected to the data line Dj, and the other electrode is connected to the gate electrode of the transistor T1. The transistor T2 may be referred to as a switching transistor, a scan transistor, a scan transistor, or the like.

The gate electrode of the transistor T1 is connected to the other electrode of the transistor T2, one electrode is connected to the first power voltage line ELVDD, and the other electrode is connected to the anode electrode of the organic light emitting diode OLED1. Transistor T1 may be referred to as a driving transistor.

The storage capacitor Cst1 connects one electrode and a gate electrode of the transistor T1.

The organic light emitting diode OLED1 has an anode electrode connected to the other electrode of the transistor T1 and a cathode electrode connected to the second power supply voltage line ELVSS.

When a turn-on level (low level) scan signal is supplied to the gate terminal of the transistor T2 through the scan line Si, the transistor T2 connects the data line Dj and one electrode of the storage capacitor Cst1. . Accordingly, a voltage value according to a difference between the data voltage DATAij applied through the data line Dj and the first power supply voltage is written in the storage capacitor Cst1. The transistor T1 allows a driving current determined according to a voltage value written in the storage capacitor Cst1 to flow from the first power voltage line ELVDD to the second power voltage line ELVSS. The organic light emitting diode OLED1 emits light with luminance according to the amount of driving current.

4 is a diagram for explaining a display device according to another exemplary embodiment of the present invention.

Referring to FIG. 4 , the display device 10' includes a timing controller 11', a data driver 12', a scan driver 13', a pixel unit 14', a grayscale corrector 15', and and a light emitting driver 16'.

Compared to the embodiment of FIG. 1 , the display device 10' further includes a light emitting driver 16'. Other elements of the display device 10', except for the light emitting driver 16', may be configured identically or similarly to those of the display device 10 of FIG. 1, and thus duplicate descriptions are omitted.

The light-emitting driver 16' transmits light-emitting signals for determining the light-emitting period of the pixels (..., PX1', PX2', PX3', ...) of the pixel part 14' to the light-emitting lines E1 and E2. , E3, ..., Em'). The light emitting driver 16' may provide light emitting signals of a turn-off level to the light emitting lines E1 to Em' during a period in which a scan signal of a corresponding turn-on level is supplied. According to one embodiment, the light emitting driver 16' may be of a sequential light emitting type. The light-emitting driver 16' may be configured in the form of a shift register, and may generate light-emitting signals in a manner of sequentially transmitting a light-emitting start signal to a next stage circuit under the control of a clock signal. According to another embodiment, the light emitting driver 16' may be of a simultaneous emission type that simultaneously emits light from all pixel rows.

FIG. 5 is a diagram for explaining a pixel according to the exemplary embodiment of FIG. 4 .

Referring to FIG. 5 , the pixel PXij′ may include transistors M1 , M2 , M3 , M4 , M5 , M6 , and M7 , a storage capacitor Cst2 , and an organic light emitting diode OLED2 .

One electrode of the storage capacitor Cst2 may be connected to the first power voltage line ELVDD, and the other electrode may be connected to the gate electrode of the transistor M1.

Transistor M1 may have one electrode connected to another electrode of transistor M5, another electrode connected to one electrode of transistor M6, and a gate electrode connected to another electrode of storage capacitor Cst2. Transistor M1 may be referred to as a driving transistor. The transistor M1 determines the amount of driving current flowing between the first power voltage line ELVDD and the second power voltage line ELVSS according to the potential difference between the gate electrode and the source electrode.

Transistor M2 may have one electrode connected to the data line Dj, another electrode connected to one electrode of the transistor M1, and a gate electrode connected to the current scan line Si. The transistor M2 may be referred to as a switching transistor, a scan transistor, a scan transistor, or the like. The transistor M2 applies the data voltage of the data line Dj to the pixel PXij when a scan signal having a turn-on level is applied to the current scan line Si.

The transistor M3 has one electrode connected to the other electrode of the transistor M1, the other electrode connected to the gate electrode of the transistor M1, and the gate electrode connected to the current scan line Si. The transistor M3 connects the transistor M1 in a diode form when a turn-on level scan signal is applied to the current scan line Si.

The transistor M4 has one electrode connected to the gate electrode of the transistor M1, the other electrode connected to the initialization voltage line VINT, and the gate electrode connected to the previous scan line S(i-1). In another embodiment, the gate electrode of transistor M4 may be connected to another scan line. Transistor M4 transfers the initialization voltage VINT to the gate electrode of transistor M1 when a scan signal with a turn-on level is applied to the previous scan line S(i-1), and thus transmits the initialization voltage VINT to the gate electrode of transistor M1. Initialize the amount of charge.

Transistor M5 has one electrode connected to the first power supply voltage line ELVDD, another electrode connected to one electrode of transistor M1, and a gate electrode connected to emission line Ei. The transistor M6 has one electrode connected to the other electrode of the transistor M1, another electrode connected to the anode electrode of the organic light emitting diode OELD2, and a gate electrode connected to the emission line Ei. Transistors M5 and M6 may be referred to as light emitting transistors. The transistors M5 and M6 form a driving current path between the first power voltage line ELVDD and the second power voltage line ELVSS to emit light from the organic light emitting diode OELD2 when a turn-on light emitting signal is applied.

Transistor M7 has one electrode connected to the anode electrode of the organic light emitting diode OLED2, another electrode connected to the initialization voltage line VINT, and a gate electrode connected to the current scan line Si. In another embodiment, the gate electrode of transistor M7 may be connected to another scan line. For example, the gate electrode of the transistor M7 may be connected to the next scan line (i+1 th scan line) or the next scan line. Transistor M7 transfers an initialization voltage to the anode electrode of organic light emitting diode OLED2 when a scan signal having a turn-on level is applied to current scan line Si, thereby initializing the amount of charge accumulated in organic light emitting diode OELD2.

The organic light emitting diode OLED2 has an anode electrode connected to the other electrode of the transistor M6 and a cathode electrode connected to the second power supply voltage line ELVSS.

FIG. 6 is a diagram for explaining a method of driving the pixels of FIG. 5 .

First, the data voltage DATA(i-1)j for the previous pixel row is applied to the data line Dj, and a turn-on level (low level) scan signal is applied to the previous scan line S(i-1). is authorized

Since a turn-off level (high level) scan signal is applied to the current scan line Si, the transistor M2 is turned off, and the data voltage for the previous pixel row DATA(i-1)j is the pixel ( PXij) is prevented.

At this time, since the transistor M4 is turned on, an initialization voltage is applied to the gate electrode of the transistor M1 to initialize the amount of charge. Since the light emission control signal of the turn-off level is applied to the light-emitting line Ei, the transistors M5 and M6 are in a turned-off state, and unnecessary light emission of the organic light-emitting diode OLED2 according to the application of the initialization voltage is prevented.

Next, the data voltage DATAij for the current pixel row is applied to the data line Dj, and a scan signal having a turn-on level is applied to the current scan line Si. Accordingly, the transistors M2, M1, and M3 are in a conducting state, and the data line Dj and the gate electrode of the transistor M1 are electrically connected. Accordingly, the data voltage DATAij is applied to the other electrode of the storage capacitor Cst2, and the storage capacitor Cst1 accumulates an amount of charge corresponding to a difference between the voltage of the first power voltage line ELVDD and the data voltage DATAij. do.

At this time, since the transistor M7 is turned on, the anode electrode of the organic light emitting diode OLED2 is connected to the initialization voltage line VINT, and the organic light emitting diode OELD2 corresponds to a voltage difference between the initialization voltage and the second power supply voltage. It is precharged or initialized with the amount of charge that

Thereafter, as the light emitting signal of the turn-on level is applied to the light emitting line Ei, the transistors M5 and M6 are conducted, and the amount of driving current passing through the transistor M1 is adjusted according to the amount of charge accumulated in the storage capacitor Cst2. and the driving current flows to the organic light emitting diode OLED2. The organic light emitting diode OLED2 emits light until a turn-off level light emitting signal is applied to the light emitting line Ei.

7 is a diagram for explaining a first image frame to which anti-aliasing is not applied, displayed in an RGB-stripe structure.

Unlike the exemplary embodiments of FIGS. 1 and 4 , the pixel unit displaying the first image frame IMF1 of FIG. 7 has an RGB-stripe structure.

Referring to FIG. 7 , each of the dots DT1a, DT2a, DT3a, DT4a, DT5a, DT6a, DT1a', DT2a', DT3a', DT4a', DT5a', DT6a', ...) is in a first direction ( DR1) may include pixels of the first color (C1), pixels of the second color (C2), and pixels of the third color (C3) sequentially positioned. This pixel arrangement structure may be named an RGB-stripe structure.

The processor 9 may provide grayscale values corresponding to pixels to the timing controller 11 so that the pixels have a target luminance level for the first image frame IMF1 . For example, when a grayscale value is expressed by 8 bits, 256 (= 2 ⁸ ) grayscale values can be expressed in each pixel. The number of bits representing each grayscale value may vary according to specifications of the processor 9 or display device 10 .

The processor 9 displays the dots constituting the character (DT1a, DT2a, DT6a, DT3a', DT1a', DT5a', ...) in black to display the character in the first image frame IMF1. , DT3a, DT4a, DT6a, DT2a', DT3a', DT6a', ...) that do not constitute a character can provide grayscale values for pixels to the timing controller 11 so that white is displayed. there is.

For example, the processor 9 may provide all grayscale values of pixels included in black dots as '0' and all grayscale values of pixels included in white dots as '255'.

However, since a dot has a larger size than a pixel, aliasing may be recognized by a user in the first image frame IMF1 in which characters are expressed in dot units.

FIG. 8 is a diagram for explaining a second image frame to which anti-aliasing is applied, displayed in an RGB-stripe structure, and FIG. 9 is an enlarged view of first to third dots of FIG. 8 .

Unlike the exemplary embodiments of FIGS. 1 and 4 , the pixel unit displaying the second image frame IMF2 of FIG. 8 has an RGB-stripe structure. A structure of the pixel unit of FIG. 8 may be the same as that of the pixel unit of FIG. 7 .

Referring to FIG. 8 , each of the dots DT1b, DT2b, DT3b, DT4b, DT5b, DT6b, DT1b', DT2b', DT3b', DT4b', DT5b', DT6b', ...) is in a first direction ( DR1) may include pixels of the first color (C1), pixels of the second color (C2), and pixels of the third color (C3) sequentially positioned.

The processor 9 may provide grayscale values of the second image frame IMF2 to which anti-aliasing is applied to the characters of the first image frame IMF2 to the timing controller 11 . The text of the second image frame IMF2 of FIG. 8 may have a different font from the text of the first image frame IMF1 of FIG. 7 . In one embodiment, the processor 9 does not convert the characters of the first image frame IMF1 into the characters of the second image frame IMF2 through a separate processing process, but instead converts the grayscale value so that an anti-aliasing effect appears. Characters of this specific font may be included in the second image frame IMF2. For example, a clear-type font provided by Windows may correspond to this embodiment. In another embodiment, the processor 9 may convert the grayscale values of the characters of the first image frame IMF1 through an anti-aliasing algorithm to generate the grayscale values of the characters of the second image frame IMF2.

The processor 9 may provide grayscale values to the timing controller 11 so that the pixels of the dots DT1b and DT1b' constituting the edge of the character have luminance levels that sequentially rise or fall. Here, the edge of the character may refer to an edge located in the first direction DR1 or in a direction opposite to the first direction DR1 based on the character.

For example, referring to FIG. 9 , a first dot DT1b constituting an edge of a character in a direction opposite to the first direction DR1 based on the character corresponds to the first to third pixels PX1b, PX2b, and PX3b. ), and the processor 9 may provide first to third grayscale values so that the first to third pixels PX1b, PX2b, and PX3b have luminance levels that sequentially decrease. That is, the first to third grayscale values are different from each other, and the second grayscale value may correspond to a value between the first grayscale value and the third grayscale value. For example, the processor 9 provides a first grayscale value of '200' to the first pixel PX1b, provides a second grayscale value of '100' to the second pixel PX2b, and provides a third grayscale value to the third pixel PX2b. A third grayscale value of '50' may be provided for (PX3b).

At this time, the processor 9 provides a grayscale value of '255' to the pixels of the third dot DT3b positioned in the opposite direction to the first direction DR1 of the first dot DT1b, and ) may provide a grayscale value of '0' to the pixels of the second dot DT2b located in the first direction DR1.

Similarly, the first dot DT1b' constituting the edge of the character in the first direction DR1 based on the character includes first to third pixels, and the processor 9 controls the first to third pixels. First to third grayscale values having a luminance level that sequentially rises may be provided. That is, the first to third grayscale values are different from each other, and the second grayscale value may correspond to a value between the first grayscale value and the third grayscale value. For example, the processor 9 provides a first grayscale value '50' for a first pixel, a second grayscale value '100' for a second pixel, and a third grayscale value for a third pixel. You can provide '200'.

At this time, the processor 9 provides a grayscale value '0' to the pixels of the third dot DT3b' located in the opposite direction to the first direction DR1 of the first dot DT1b', and A grayscale value of '255' may be provided to the pixels of the second dot DT2b' located in the first direction DR1 of (DT1b').

Accordingly, the user can more smoothly and clearly view the text included in the second image frame IMF2 of FIG. 8 compared to the text included in the first image frame IMF1 of FIG. 7 .

10 is a diagram for explaining a case in which a second image frame is displayed without correction in an S-stripe structure.

Referring to FIG. 10 , a case in which grayscale values of the second image frame IMF2 provided by the processor 9 are applied to the pixel unit 14 of the display device 10 of FIG. 1 without correction is illustrated.

Since the second image frame IMF2 provided by the processor 9 is based on the RGB-stripe structure, the second image frame IMF2 is applied to the pixel unit 14 of the display device 10 having the S-stripe structure. ) is applied as it is, the desired anti-aliasing effect cannot be exhibited.

In the above example, in the second image frame IMF2, the first grayscale value of the first pixel PX1b is provided as '200' and the second grayscale value of the second pixel PX2b is provided as '100'. , the third grayscale value of the third pixel PX3b is provided as '50'. In this case, the first grayscale value of the first pixel PX1 located in the same column in the second direction DR2 becomes '200' and the second grayscale value of the second pixel PX2 becomes '100', so that the displayed The letter has a sawtooth-shaped edge. Therefore, the first grayscale value and the second grayscale value need to be corrected. However, since the relative position of the third pixel PX3 in the first dot DT1 of the S-stripe structure is the same as or similar to that of the third pixel PX3b in the first dot DT1b of the RGB-stripe structure, Correction of grayscale values may be unnecessary.

11 is a diagram for explaining a grayscale compensator according to the first embodiment of the present invention, and FIG. 12 is a diagram for explaining a third image frame in which a second image frame is corrected by the grayscale compensator of the first embodiment. .

Referring to FIG. 11 , the gray level corrector 15a of the first embodiment may include a first dot detector 110 and a first dot converter 120 .

The first dot detector 110 calculates the first to third dots DT1 , DT2 , and DT3 based on the grayscale values G11 , G12 , G13 , G21 , G22 , G23 , G31 , G32 , and G33 . When the edge value of 1 dot DT1 is equal to or greater than the threshold value, the first detection signal 1DS may be output.

Unless the timing controller 11 separately receives information on the pixels constituting the character from the processor 9, it is necessary to detect which dots constitute the edge of the character before performing correction. However, since the display device 10 cannot distinguish whether the detected dot is the edge of a picture or the edge of a character unless separate information is received from the processor 9, hereinafter, the first dot detection unit 110 It is described as a process of detecting the edge of an object.

In addition, below, the first dot detection unit 110 detects whether the target dot corresponds to the edge dot in units of dots. For example, when there are three pixels constituting a dot, an average value of grayscale values for the three pixels may be used as the dot value. In this case, depending on the embodiment, grayscale values of each pixel may be multiplied by a weight. Hereinafter, for convenience of description, the average value of the grayscale values constituting a dot will be described as the dot value by setting all the weights of the grayscale values of each pixel to 1.

According to an embodiment, the first dot detector 110 uses a single row prewitt mask having the first direction DR1 as a row direction to the first to third dots DT1, DT2, and DT3. By applying to , the edge value of the first dot DT1 can be calculated. For example, a single row prewit mask may correspond to Equation 1 below. In the case of using a single-row prewrite mask, an existing line buffer of the timing controller 11 can be used, and a separate line buffer is unnecessary, so cost can be reduced.

[Equation 1]

[-1 0 1]

In Equation 1, '0' in the first row, column 2 can be multiplied by the value of the discrimination target dot, and '-1' in the first row, column 1 is the value of a dot adjacent to the discrimination target dot in the opposite direction to the first direction DR1. , and '1' in the first row and third column may be multiplied by the value of a dot adjacent to the first direction DR1 of the discrimination target dot. The sum of the multiplied values may correspond to the edge value of the dot to be determined. Here, when the edge value is a negative number, it means that the grayscale value tends to fall in the first direction DR1 with the dot to be determined as a boundary. In addition, when the edge value is a positive number, it means that the grayscale value tends to increase in the first direction DR1 with the dot to be determined as a boundary.

For example, referring to FIGS. 8, 9, and 10, the case where the third dot DT3 corresponds to the discrimination target dot will be described. Since the grayscale values G31, G32, and G33 of the third dot DT3 are all '255', the value of the third dot DT3 is '255'. A value of a dot adjacent to the third dot DT3 in a direction opposite to the first direction DR1 is '255'. Since the grayscale values G11, G12, and G13 of the first dot DT1 adjacent to the first direction DR1 of the third dot DT3 are '200', '100', and '50', respectively, the first dot ( The value of DT1) is '116' (the decimal point part is clipped for convenience). Accordingly, when Equation 1 is applied with the third dot DT3 as the discrimination target dot, the edge value of the third dot DT3 becomes '-139' according to Equation 2 below.

[Equation 2]

255*(-1) + 255*0 + 116*1 = -139

Also, for example, referring to FIGS. 8 and 9 , a case in which the first dot DT1 corresponds to the discrimination target dot will be described. As described above, the value of the first dot DT1 is '116' as described above, and the value of the third dot DT3 is '255'. Since all of the grayscale values G21, G22, and G23 of the second dot DT2 are '0', the value of the second dot DT2 is '0'. Accordingly, when Equation 1 is applied with the first dot DT1 as the discrimination target dot, the edge value of the first dot DT1 becomes '-255' according to Equation 3 below.

[Equation 3]

255*(-1) + 116*0 + 0*1 = -255

Also, for example, referring to FIGS. 8 and 9 , the case where the second dot DT2 corresponds to the discrimination target dot will be described. As described above, the value of the second dot DT2 is '0', the value of the first dot DT1 is '116', and the value of the dot adjacent to the first direction DR1 of the second dot DT2 is '116'. The value is '116'. Therefore, when Equation 1 is applied with the second dot DT2 as the discrimination target dot, the edge value of the second dot DT2 becomes '0' according to Equation 4 below.

[Equation 4]

116*(-1) + 0*0 + 116*1 = 0

According to an embodiment, the first dot detector 110 may determine that the discrimination target dot corresponds to an edge dot and output the first detection signal DS when the edge value of the discrimination target dot is equal to or greater than the threshold value.

For example, the threshold value may be predetermined as 70% of the maximum value of the dot value. In this case, if the maximum value of the dot value is 255, the threshold value becomes 178. Referring to Equations 2, 3, and 4, the absolute value of the edge value of only the first dot DT1 among the dots DT3, DT1, and DT2 exceeds 178. Accordingly, the first dot detector 110 may output the first detection signal 1DS only for the first dot DT1 among the dots DT3 , DT1 , and DT2 .

A prewit mask of a single row may be set as in Equation 5 below.

[Equation 5]

[1 0 -1]

When the mask of Equation 5 is compared to the mask of Equation 1, the sign of the derived edge value may be reversed.

In another embodiment, the first dot detector 110 uses a plurality of rows of prewit masks or Sobel masks in which the first direction DR1 is a row direction and the second direction DR2 is a column direction. Using this, it is possible to calculate the edge value of the discrimination target dot.

For example, a multi-row prewit mask may correspond to Equation 6 or Equation 7.

[Equation 6]

[Equation 7]

According to Equations 6 and 7, when the edge value of the first dot DT1 is calculated, three previous row dots and three next row dots of the first to third dots DT1, DT2, and DT3 are further is considered Since the calculation method is similar to the case of using a single row prewit mask, it will not be repeatedly described.

For example, a multi-row Sobel mask may correspond to Equation 8 or Equation 9.

[Equation 8]

[Equation 9]

Since the calculation method is similar to the case of using a multi-row prewit mask, it will not be repeatedly described.

When the first detection signal 1DS is input, the first dot conversion unit 120 converts the first grayscale value G11 into a first corrected grayscale value G11' and converts the second grayscale value G12 into It can be converted into the second corrected grayscale value G12'.

In one embodiment, the first dot converter 120 may generate the same first and second correction grayscale values G11' and G12'.

For example, the first dot conversion unit 120 converts the average value of the first grayscale value G11 and the second grayscale value G12 into the first corrected grayscale value G11' and the second corrected grayscale value G12'. ) can be set. That is, when the first grayscale value G11 is '200' and the second grayscale value G12 is '100' in the second image frame IMF2, the first pixel in the third image frame IMF3 after correction is The first correction grayscale value G11' for PX1 may be set to '150', and the second correction grayscale value G12' for the second pixel PX2 may be set to '150'.

The data driver 12 supplies the first data voltage corresponding to the first corrected grayscale value G11' to the first pixel PX1 and supplies the second data voltage corresponding to the second corrected grayscale value G12' to the first pixel PX1. The third data voltage may be supplied to the second pixel PX2 and the third data voltage corresponding to the third grayscale value G13 may be supplied to the third pixel PX3 .

Unlike the second image frame IMF2 of FIG. 10, the grayscale values in the third image frame IMF3 of FIG. 12 sequentially descend along the first direction DR1, so that the anti-aliasing effect is effective even in the S-stripe structure. can be demonstrated. That is, even if the processor 9 provides the second image frame IMF2 for the anti-aliasing font regardless of the structure of the pixel unit 14 of the display device 10, the second image frame IMF2 is displayed on the side of the display device 10. An anti-aliasing effect may be exhibited by generating the third image frame IMF3 by correcting the frame IMF2.

For another example, the first dot converter 120 applies a value obtained by applying the first weight wr to the first grayscale value G11 and a value obtained by applying the second weight wg to the second grayscale value G12. The first correction grayscale value G11' and the second correction grayscale value G12' may be set by summing .

For example, the same first and second correction grayscale values G11' and G12' may be calculated using Equations 10 and 11 below.

[Equation 10]

G11'= wr*G11 + wg*G12

[Equation 11]

G12'= wr*G11 + wg*G12

In this case, when the luminance of the first pixel PX1 is lower than the luminance of the second pixel PX2 for the same grayscale value, the first weight wr may be smaller than the second weight wg. Conversely, when the luminance of the first pixel PX1 is higher than the luminance of the second pixel PX2 for the same grayscale value, the first weight wr may be greater than the second weight wg. That is, according to Equations 10 and 11, in setting the first correction grayscale value G11' and the second correction grayscale value G12', the grayscale value of a pixel having a low luminance contribution rate is reflected small, and the luminance contribution rate is small. A grayscale value of a large pixel may be greatly reflected.

For exemplary first weights wr and second weights wg, refer to the description of FIG. 13 .

FIG. 13 is a diagram for explaining a third image frame in which the second image frame is differently corrected by the gradation corrector according to the first embodiment.

The third image frame IMF3' of FIG. 13 may have different first and second correction grayscale values G11' and G12' compared to the third image frame IMF3 of FIG. 12 . there is.

The first dot conversion unit 120 sums the first correction grayscale value G11' and the second correction grayscale value G12' by adding the first grayscale value G11 and the second grayscale value G12. The first correction grayscale value G11' and the second correction grayscale value G12' may be generated to be equal to one value. In this case, the first correction grayscale value G11' and the second correction grayscale value G12' may be different from each other.

For example, when the luminance of the first pixel PX1 is configured to be lower than the luminance of the second pixel PX2 for the same grayscale value, the first compensation grayscale value G11' is the second compensation grayscale value G12. ') can be higher.

Referring to the ITU-R BT.601 standard, it is described that the following Equation 12 is established based on the fact that the degrees of contribution of red, green, and blue to luminance are different even for the same grayscale value.

[Equation 12]

Y = wr*R + wg*G + wb*B, where wr=0.299, wg=0.587, wb=0.114

Here, Y is luminance, R is a grayscale value of a red pixel, G is a grayscale value of a green pixel, B is a grayscale value of a blue pixel, and wr, wg, and wb are weights of each color. That is, for the same grayscale value, a green pixel may be the brightest and a blue pixel may be the darkest.

Therefore, when the first pixel PX1 is a red pixel and the second pixel PX2 is a green pixel, the luminance of the first pixel PX1 is lower than that of the second pixel PX2 for the same grayscale value. can In this case, the luminance level of the first pixel PX1 and the luminance level of the second pixel PX2 are substantially the same by setting the first compensation grayscale value G11' higher than the second compensation grayscale value G12'. can do.

On the other hand, when the luminance of the second pixel PX2 is configured to be lower than the luminance of the first pixel PX1 for the same grayscale value, the second compensation grayscale value G12' is the first compensation grayscale value G11'. ) can be higher than

Therefore, when the first pixel PX1 is a green pixel and the second pixel PX2 is a red pixel, the luminance of the second pixel PX2 is lower than that of the first pixel PX1 for the same grayscale value. can In this case, the luminance level of the first pixel PX1 and the luminance level of the second pixel PX2 are substantially the same by setting the second compensation grayscale value G12' higher than the first compensation grayscale value G11'. can do.

In another embodiment, the first dot converter 120 converts the first corrected grayscale value G11' and the second corrected grayscale value G12' obtained by Equations 10 and 11 into Equations 13 and 11 below. Through 14, the first final corrected grayscale value G11_f and the second final corrected grayscale value G12_f may be calculated.

[Equation 13]

G11_f = G11'/(wr*2)

[Equation 14]

G12_f = G12'/(wg*2)

According to Equations 13 and 14, when the luminance of the first pixel PX1 is configured to be lower than the luminance of the second pixel PX2 for the same grayscale value, the first final corrected grayscale value G11_f is the second final corrected grayscale value G11_f. It may be higher than the corrected grayscale value (G12_f). On the other hand, when the luminance of the second pixel PX2 is configured to be lower than the luminance of the first pixel PX1 for the same grayscale value, the second final corrected grayscale value G12_f is equal to the first final corrected grayscale value G11_f. can be higher

FIG. 14 is an enlarged view of fourth to sixth dots of FIG. 8 .

8 and 14 , the fifth dot DT5b is adjacent to the fourth dot DT4b in the second direction DR2. The sixth dot DT6b is adjacent to the fourth dot DT4b in a direction opposite to the second direction DR2 .

In the second image frame IMF2, the fifth dot DT5b and the fourth dot DT4b do not constitute characters and display white, and the sixth dot DT6b constitute characters and display black. . All grayscale values of the pixels of the fifth dot DT5b may be '255', and thus the value of the fifth dot DT5b may be '255'. Grayscale values of the fourth pixel DT4b, fifth pixel DT5b, and sixth pixel DT6b of the fourth dot DT4b may all be '255', and thus the value of the fourth dot DT4b is It can be '255'. All grayscale values of the pixels of the sixth dot DT6b may be '0', and thus the value of the sixth dot DT6b may be '0'.

In the second image frame IMF2, the fourth dot DT4b is in contact with the sixth dot DT6b corresponding to the edge of the character. Since the pixels PX4, PX5, and PX6 of the fourth dot DT4b contact the sixth dot DT6b in the second direction DR2 at the same or similar ratio with respect to the first direction DR1, RGB- There is no particular problem in displaying the second image frame IMF2 in the stripe structure.

15 is a diagram for explaining a case in which a second image frame is displayed without correction in an S-stripe structure.

Referring to FIG. 15 , a case in which the second image frame IMF2 is displayed in the pixel unit 14 of the display device 10 of FIG. 1 will be described.

In the pixel unit 14 , the fifth dot DT5 is adjacent to the fourth dot DT4 in the second direction DR2 . The sixth dot DT6 is adjacent to the fourth dot DT4 in a direction opposite to the second direction DR2 .

The fourth dot DT4 includes the fourth pixel PX4 , the fifth pixel PX5 , and the sixth pixel PX6 , and the sixth pixel PX6 includes the fourth pixel PX4 and the fifth pixel ( The fourth pixel PX4 may be positioned in the first direction DR1 from the PX5 , and the fourth pixel PX4 may be positioned in the second direction DR2 from the fifth pixel PX5 .

In the second image frame IMF2, the fifth dot DT5 and the fourth dot DT4 do not constitute characters and display white, and the sixth dot DT6 constitute characters and display black. . All grayscale values of the pixels of the fifth dot DT5 may be '255', and thus the value of the fifth dot DT5 may be '255'. Grayscale values of the fourth pixel PX4 , fifth pixel PX5 , and sixth pixel PX6 of the fourth dot DT4 may all be '255', and thus the value of the fourth dot DT4 is It can be '255'. All grayscale values of the pixels of the sixth dot DT6 may be '0', and thus the value of the sixth dot DT6 may be '0'.

Unlike the case of FIG. 14 , a distance between the fourth pixel PX4 and the sixth dot DT6 is different from a distance between the fifth pixel PX5 and the sixth dot DT6 . That is, the distance between the fifth pixel PX5 and the sixth dot DT6 is shorter than the distance between the fourth pixel PX4 and the sixth dot DT6. Accordingly, a stripe extending in the first direction DR1 of the second color C2 of the fifth pixel PX5 may be recognized by the user at the upper edge of the character (color blinding problem).

On the other hand, referring to FIG. 8 , in the fourth dot of the pixel unit 14 corresponding to the fourth dot DT4b', the distance between the fourth pixel and the sixth dot is greater than the distance between the fifth pixel and the sixth dot. shorter Accordingly, a stripe extending in the first direction DR1 of the first color C1 of the fourth pixel may be recognized by the user at the lower edge of the character.

FIG. 16 is a diagram for explaining a grayscale compensator according to the second embodiment of the present invention, and FIG. 17 is a diagram for explaining a fourth image frame in which the second image frame is corrected by the grayscale compensator of the second embodiment. .

Referring to FIG. 16 , the gray level corrector 15b of the second embodiment may include a second dot detector 210 and a second dot converter 220 .

The second dot detector 210 detects the fourth to sixth dots based on the grayscale values G41 , G42 , G43 , G51 , G52 , G53 , G61 , G62 , and G63 of the fourth to sixth dots DT4 , DT5 , and DT6 . When the dot DT4 is determined to be a dot contacting an edge of an object included in the second image frame IMF2, the second detection signal 2DS may be output.

For example, the second dot detector 210 determines grayscale values G41, G42, G43, G51, G52, G53, G61, G62, and G63 for the fourth to sixth dots DT4, DT5, and DT6. Based on this, when the edge value of the fourth dot DT4 is equal to or greater than the threshold value, the second detection signal 2DS may be output.

According to an exemplary embodiment, the second dot detector 210 applies a prewit mask of a single column having the second direction DR2 as a column direction to the fourth to sixth dots DT4 , DT5 , and DT6 to detect the first The edge value of 4 dots (DT4) can be calculated. For example, a single-column prewit mask may correspond to Equation 15 below.

[Equation 15]

In Equation 15, '0' in the second row, column 1 can be multiplied by the value of the discrimination target dot, and '1' in the first row, column 1 can be multiplied by the value of the dot adjacent to the discrimination target dot in the second direction (DR2). '-1' in row 3 and column 1 may be multiplied by a value of a dot adjacent to the discrimination target dot in a direction opposite to the second direction DR2. The sum of the multiplied values may correspond to the edge value of the dot to be determined. Here, when the edge value is a negative number, it means that the grayscale value tends to fall in the second direction DR2 with the dot to be determined as a boundary. In addition, when the edge value is a positive number, it means that the grayscale value tends to increase in the second direction DR2 with the dot to be determined as a boundary.

For example, with reference to FIGS. 8, 14, and 15, the case where the fifth dot DT5 corresponds to the discrimination target dot will be described. The value of the fifth dot DT5 is '255', the value of the dot located in the second direction DR2 of the fifth dot DT5 is '255', and the value of the fourth dot DT4 is '255'. am. Accordingly, when Equation 15 is applied with the fifth dot DT5 as the discrimination target dot, the edge value of the fifth dot DT5 becomes '0'.

Also, for example, with reference to FIGS. 8, 14, and 15, the case where the fourth dot DT4 corresponds to the discrimination target dot will be described. The value of the fourth dot DT4 is '255', the value of the fifth dot DT5 is '255', and the value of the sixth dot DT6 is '0'. Accordingly, when Equation 15 is applied with the fourth dot DT4 as the discrimination target dot, the edge value of the fourth dot DT4 becomes '255'.

Also, for example, with reference to FIGS. 8, 14, and 15, the case where the sixth dot DT6 corresponds to the discrimination target dot will be described. The value of the sixth dot DT6 is '0', the value of the fourth dot DT4 is '255', and the value of the dot contacting the sixth dot DT6 in the opposite direction to the second direction DR2 is It is '255'. Accordingly, when Equation 15 is applied with the sixth dot DT6 as the discrimination target dot, the edge value of the sixth dot DT6 becomes '0'.

According to an embodiment, when the edge value of the discrimination target dot is equal to or greater than the threshold value, the second dot detector 210 determines that the discrimination target dot corresponds to a dot contacting the edge of the object and outputs the second detection signal 2DS. can do.

For example, the threshold value may be predetermined as 70% of the maximum value of the dot value. In this case, if the maximum value of the dot value is 255, the threshold value becomes 178. Among the dots DT4 , DT5 , and DT6 , the absolute value of the edge value of only the fourth dot DT4 exceeds 178 . Accordingly, the second dot detector 210 may output the second detection signal 2DS only for the fourth dot DT4 among the dots DT4 , DT5 , and DT6 .

According to an embodiment, the second detection signal 2DS may include the sign of the edge value as information.

The mask of Equation 15 may be modified as in Equation 5, Equation 6, Equation 7, Equation 8, Equation 9, and the like. Redundant explanations are omitted.

When the second detection signal 2DS is input, the second dot converter 220 generates a fourth grayscale value G41 corresponding to the fourth pixel PX4 and a second grayscale value G41 based on the second detection signal 2DS. A third corrected grayscale value may be generated by selecting one of the fifth grayscale values G42 corresponding to the 5 pixels PX5 and decreasing the selected grayscale value.

As described above, the second detection signal 2DS may include the sign of the edge value as information. For example, when the mask of Equation 15 is used, as described above, when the edge value is a negative number, it means that the grayscale value tends to decrease in the second direction DR2 with the dot to be determined as a boundary. In addition, when the edge value is a positive number, it means that the grayscale value tends to increase in the second direction DR2 with the dot to be determined as a boundary.

The edge value of the aforementioned fourth dot DT4 is '255', which is a positive number. Accordingly, the second dot converter 220 may recognize that the boundary area between the fourth dot DT4 and the sixth dot DT6 is the edge of the object based on the second detection signal 2DS. In this case, the second dot converter 220 selects the fifth grayscale value G42 corresponding to the fifth pixel PX5 and reduces the fifth grayscale value G42 to thereby reduce the third corrected grayscale value G42'. ) can be created. When the second dot converter 220 reduces the fifth grayscale value G42 to generate the third corrected grayscale value G42', the data driver 12 corresponds to the third corrected grayscale value G42'. The data voltage to be applied may be supplied to the fifth pixel PX5.

For example, the third corrected grayscale value G42' may be a grayscale value obtained by reducing the selected fifth grayscale value G42 by 20%. The reduction amount may be determined differently according to specifications of the display device 10 .

Comparing the case where the second image frame IMF2 of FIG. 15 is applied to the pixel unit 14 and the case where the fourth image frame IMF4 of FIG. 17 is applied, in the S-stripe structure, the It can be confirmed that the color blinding problem can be alleviated.

Referring to the dots DT4b', DT5b', and DT6b' of FIG. 8 , the second dot detection unit 210 determines, for the fourth to sixth dots, when the discrimination target dot is the fourth dot, the edge value The second detection signal 2DS having information that the number is negative will be output. Accordingly, the second dot converter 220 may recognize that the boundary area between the fourth dot and the fifth dot is the edge of the object based on the second detection signal 2DS. In this case, the second dot converter 220 may generate a third corrected grayscale value by selecting a fourth grayscale value corresponding to the fourth pixel and decreasing the fourth grayscale value. When the second dot converter 220 generates the third corrected grayscale value by reducing the fourth grayscale value, the data driver 12 may supply the data voltage corresponding to the third corrected grayscale value to the fourth pixel. .

18 is a diagram for explaining a gray level compensator according to a third embodiment of the present invention.

The gray level correcting unit 15c of FIG. 18 includes the gray level correcting unit 15a of FIG. 11 and the gray level correcting unit 15b of FIG. 16 .

In this case, whether correction by the first dot detection unit 110 and the first dot conversion unit 120 is performed first for the second image frame IMF2 is determined by the second dot detection unit 210 and the second dot conversion unit. It may be questioned whether the correction by 220 will be performed first.

Referring to FIGS. 7 and 8 , when the processor 9 constructs the second image frame IMF2 using an anti-aliasing font, it can be seen that there is a sequential change in grayscale values in the first direction DR1. there is.

Therefore, according to one embodiment, correction by the first dot detection unit 110 and the first dot conversion unit 120 is performed first, so that correction may be performed first in the first direction DR1, which is the main direction. The first direction DR1 may be a direction in which characters are arranged in a sentence.

However, in another embodiment, when the solution of the discoloration problem is more important than the solution of the aliasing problem, correction by the second dot detector 210 and the second dot converter 220 may be performed first.

FIG. 19 is an enlarged view of seventh to tenth dots of FIG. 8 .

The seventh dot DT7b may include a seventh pixel PX7b, an eighth pixel PX8b, and a ninth pixel PX9b. For example, the processor 9 provides a grayscale value of '50' to the seventh pixel PX7b and a grayscale value of '100' to the eighth pixel PX8b in the second image frame IMF2. A grayscale value of '200' may be provided to the 9 pixels PX9b.

The eighth dot DT8b is adjacent to the seventh dot DT7b in the first direction DR1 and may include a tenth pixel PX10b, an eleventh pixel PX11b, and a twelfth pixel PX12b. . For example, the processor 9 may provide grayscale values of '255' to the tenth pixel PX10b, the eleventh pixel PX11b, and the twelfth pixel PX12b in the second image frame IMF2.

The ninth dot DT9b is adjacent to the seventh dot DT7b in a direction opposite to the second direction DR2 and includes the thirteenth pixel PX13b, the fourteenth pixel PX14b, and the fifteenth pixel PX15b. can do. For example, the processor 9 provides a grayscale value of '50' to the thirteenth pixel PX13b in the second image frame IMF2, provides a grayscale value of '100' to the fourteenth pixel PX14b, and A grayscale value of '200' may be provided to the 15 pixels PX15b.

The tenth dot DT10b is adjacent to the ninth dot DT9b in the first direction DR1 and may include a sixteenth pixel PX16b, a seventeenth pixel PX17b, and an eighteenth pixel PX18b. . For example, the processor 9 may provide grayscale values '255' to the sixteenth pixel PX16b, the seventeenth pixel PX17b, and the eighteenth pixel PX18b in the second image frame IMF2.

In the RGB-stripe structure of FIG. 19 , since the luminance changes sequentially in the first direction DR1 and the luminance is maintained constant in the second direction DR2 , an anti-aliasing effect can be exhibited.

20 is a diagram for explaining a case in which a second image frame is displayed without correction in an S-stripe structure.

The seventh dot DT7 includes the seventh pixel PX7 , the eighth pixel PX8 , and the ninth pixel PX9 , and the ninth pixel PX9 includes the seventh pixel PX7 and the eighth pixel ( The seventh pixel PX7 may be positioned in the first direction DR1 from the PX8 , and the seventh pixel PX7 may be positioned in the second direction DR2 from the eighth pixel PX8 .

The eighth dot DT8 is adjacent to the seventh dot DT7 in the first direction DR1 and includes the tenth pixel PX10 , the eleventh pixel PX11 , and the twelfth pixel PX12 . The twelfth pixel PX12 is located in the first direction DR1 from the tenth pixel PX10 and the eleventh pixel PX11, and the tenth pixel PX10 is located in the second direction DR2 from the eleventh pixel PX11. can be located

The ninth dot DT9 is adjacent to the seventh dot DT7 in a direction opposite to the second direction DR2 and includes the thirteenth pixel PX13 , the fourteenth pixel PX14 , and the fifteenth pixel PX15 . The 15th pixel PX15 is located in the first direction DR1 from the 13th pixel PX13 and the 14th pixel PX14, and the 13th pixel PX13 is located in the second direction (DR1) from the 14th pixel PX14. DR2) may be located.

The tenth dot DT10 is adjacent to the ninth dot DT9 in the first direction DR1, includes the sixteenth pixel PX16, the seventeenth pixel PX17, and the eighteenth pixel PX18, and The 18 pixels PX18 are positioned in the first direction DR1 from the sixteenth pixel PX16 and the seventeenth pixel PX17, and the sixteenth pixel PX16 is positioned in the second direction DR2 from the seventeenth pixel PX17. can be located

In the S-stripe structure of FIG. 20 , when the grayscale values of the second image frame IMF2 are applied without correction, the luminance change in the first direction DR1 and/or the second direction DR2 becomes irregular, resulting in anti -An aliasing effect cannot be exhibited properly.

In addition, the second color in the eighth pixel PX8 and the fourteenth pixel PX14 provided with grayscale values of '100' compared to the seventh pixel PX7 and the fourteenth pixel PX13 provided with grayscale values of '50'. A discoloration phenomenon may occur for (C2). This color blinding phenomenon may occur more strongly when the luminance of the second color C2 is higher than that of the first color C1 for the same grayscale value. For example, the second color C2 may be green and the first color C1 may be red.

21 is a diagram for explaining a grayscale compensator according to a fourth embodiment of the present invention, and FIG. 22 is a diagram for explaining a fifth partial image frame in which a second image frame is partially corrected by the grayscale compensator of the fourth embodiment. it is a drawing

Referring to FIG. 21 , the gray level correction unit 15d may include a third dot conversion unit 320 . The gray level corrector 15d and the third dot converter 320 may refer to the same component.

Unlike other embodiments, the gray level correction unit 15d may not include a separate dot detection unit. That is, the gradation corrector 15d of the fourth embodiment can perform gradation correction on all dots without going through the edge dot detection process. However, grayscale correction may not be performed for some outermost dots to which the following equation cannot be applied.

The gradation compensator 15d adjusts the gradation values (G71, G72, G73, G81, G82, G83, G91, G92, G93, G101, G102, Based on G103), correction grayscale values G71', G72', and G73' for each color C1, C2, and C3 of the seventh dot DT7 may be generated.

The grayscale compensator 15d determines the grayscale values G71 of the seventh pixel PX7 , the tenth pixel PX10 , the thirteenth pixel PX13 , and the sixteenth pixel PX16 with respect to the first color C1 . , G81, G91, G101), a fourth corrected grayscale value G71' may be generated. In addition, the grayscale compensator 15d determines the grayscale values of the eighth pixel PX8, the eleventh pixel PX11, the fourteenth pixel PX14, and the seventeenth pixel PX17 with respect to the second color C2 ( Based on G72, G82, G92, and G102), a fifth corrected grayscale value G72' may be generated. In addition, the gradation compensator 15d determines the gradation values of the ninth pixel PX9 , the twelfth pixel PX12 , the fifteenth pixel PX15 , and the eighteenth pixel PX18 with respect to the third color C3 ( Based on G73, G83, G93, and G103), a sixth correction grayscale value G73' may be generated.

The data driver 12 supplies the data voltage corresponding to the fourth corrected grayscale value G71' to the seventh pixel PX7, and supplies the data voltage corresponding to the fifth corrected grayscale value G72' to the eighth pixel. (PX8) and the data voltage corresponding to the sixth correction grayscale value (G73') may be supplied to the ninth pixel (PX9).

For example, the grayscale compensator 15d may generate fourth to sixth corrected grayscale values G71', G72', and G73' for the seventh dot DT7 based on Equation 16 below.

[Equation 16]

Here, F1 is a weight applied to each of the pixels PX7, PX8, and PX9 of the seventh dot DT7, and F2 is a weight applied to each of the pixels PX10, PX11, and PX12 of the eighth dot DT8. , F3 is a weight to be multiplied with each of the pixels PX13, PX14, and PX15 of the ninth dot DT9, and F4 is a weight to be multiplied with each of the pixels PX16, PX17, and PX18 of the tenth dot DT10. can be

According to one embodiment, in Equation 16, the size of F1 may be greater than that of F2, F3, and F4. That is, the self-grayscale ratio may be large. Therefore, in generating the fourth corrected grayscale value G71', the weight F1 for the grayscale value G71 of the seventh pixel PX7 is the largest, and in generating the fifth corrected grayscale value G72', the weight F1 is the largest. The weight F1 for the grayscale value G72 of the 8th pixel PX8 is the largest, and the weight F1 for the grayscale value G73 of the ninth pixel PX9 is generated in generating the sixth correction grayscale value G73'. this may be the largest.

According to one embodiment, the sum of F1, F2, F3, and F4 in Equation 16 may be 1. At this time, depending on the product, F1, F2, F3, and F4 may be variably adjusted to around 20%. For example, F1 may be set to 0.625, F2 to 0.125, F3 to 0.125, and F4 to 0.125. In addition, depending on the product, F1 is a value of 0.5 or more and 0.75 or less, F2 is a value of 0.1 or more and 0.15 or less, F3 is a value of 0.1 or more and 0.15 or less, and F4 is a value of 0.1 or more and 0.15 or less.

A person skilled in the art can determine the values of F1, F2, F3, and F4 suitable for the product by appropriately adjusting the exemplified numerical values.

For example, the fourth corrected grayscale value G71' may be calculated as shown in Equation 17 below.

[Equation 17]

0.625*50 + 0.125*255 + 0.125*50 + 0.125*255 = 101.25

Here, when values below the decimal point are discarded, the fourth corrected grayscale value G71' may be '101'.

For example, the fifth corrected grayscale value G72' may be calculated as shown in Equation 18 below.

[Equation 18]

0.625*100 + 0.125*255 + 0.125*100 + 0.125*255 = 138.75

Here, when values below the decimal point are discarded, the fifth corrected grayscale value G72' may be '138'.

For example, the sixth corrected grayscale value G73' may be calculated as shown in Equation 19 below.

[Equation 19]

0.625*200 + 0.125*255 + 0.125*200 + 0.125*255 = 213.75

Here, when a value below the decimal point is discarded, the sixth corrected grayscale value G73' may be '213'.

It can be seen that the difference between the calculated fourth to sixth corrected grayscale values G71', G72', and G73' is reduced compared to the grayscale values before correction (G71, G72, and G73). Accordingly, the color blinding problem occurring in FIG. 20 can be alleviated.

In addition, it can be seen that the calculated fourth to sixth corrected grayscale values G71', G72', and G73' are corrected in a higher grayscale direction than the grayscale values before correction (G71, G72, and G73). Since the human eye is less sensitive to a change in a high gray level than a change in a low gray level, the color blinding problem in FIG. 20 can be further alleviated.

22 shows a fifth partial image frame IMF5p to which correction grayscale values G71', G72', and G73' are applied to some dots, that is, the seventh dot DT7 of the second image frame IMF2. The same processing may be performed by the gradation correction unit 15d on the other dots DT8, DT9, DT10, .... The data processed by the grayscale corrector 15d depends on the data of the second image frame IMF2 provided by the processor 9 and is independent of the data of the already processed fifth partial image frame IMF5p. can be

According to an embodiment, the grayscale corrector 15d may set F3 and F4 of Equation 16 to 0 in order to perform correction in the first direction DR1. For example, F1 = 0.75, F2 = 0.25, F3 = 0, F4 = 0.

Also, according to another embodiment, the grayscale corrector 15d may set F2 and F4 of Equation 16 to 0 in order to perform correction for the second direction DR2. For example, F1 = 0.75, F2 = 0, F3 = 0.25, F4 = 0.

FIG. 23 is a diagram for explaining a case in which embodiments of the present invention are applied to an S-stripe structure different from those of FIGS. 1 and 4 .

Referring to FIG. 23 , the first dot nDT includes a first pixel nPX1 , a second pixel nPX2 , and a third pixel nPX3 , and the first pixel nPX1 is the second pixel nPX2 . ) in the first direction DR1, and the first pixel nPX1 and the second pixel nPX2 may be positioned in the second direction DR2 from the third pixel nPX3.

That is, the first dot nDT of FIG. 23 may be inclined by 90 degrees compared to the first dot DT1 of FIG. 1 .

23 , a second dot adjacent to the first dot nDT in the first direction DR1 and a third dot adjacent to the first dot nDT in a direction opposite to the first direction DR1 are included. can

All embodiments applicable to the first dot DT1 of FIG. 1 may be applied to the first dot nDT of FIG. 23 .

For example, when the grayscale corrector determines that the first dot nDT is the edge of an object included in the image frame based on the grayscale values of the first to third dots, the first pixel nPX1 corresponds to the first dot nDT. A first compensation grayscale value and a second compensation grayscale value may be generated based on the grayscale value and the second grayscale value corresponding to the second pixel nPX2 .

The grayscale compensator may include a first dot detector outputting a first detection signal when an edge value of the first dot nDT calculated based on grayscale values of the first to third dots is greater than or equal to a threshold value.

In addition, when the first detection signal is input, the grayscale corrector converts the first grayscale value into a first corrected grayscale value, converts the second grayscale value into a second corrected grayscale value, and converts the first corrected grayscale value into a second corrected grayscale value. The corrected grayscale values may include the same first dot converter.

On the other hand, when the first detection signal is input, the grayscale corrector converts the first grayscale value into a first corrected grayscale value, converts the second grayscale value into a second corrected grayscale value, and converts the first grayscale value and the second grayscale value into a second corrected grayscale value. The first dot conversion unit may include a sum of the grayscale values equal to a sum of the first corrected grayscale value and the second corrected grayscale value.

23 , a fifth dot adjacent to the fourth dot in the second direction DR2 and a sixth dot adjacent to the fourth dot in a direction opposite to the second direction DR2 may be included. The fourth dot includes a fourth pixel, a fifth pixel, and a sixth pixel, the sixth pixel is located in the first direction DR1 from the fourth pixel and the fifth pixel, and the fourth pixel is located away from the fifth pixel. It may be located in two directions (DR2).

The grayscale corrector may include a second dot detector outputting a second detection signal when the fourth dot is determined to be a dot adjacent to an edge of an object included in the image frame based on the grayscale values of the fourth to sixth dots. can

The grayscale corrector selects one of a fourth grayscale value corresponding to the fourth pixel and a fifth grayscale value corresponding to the fifth pixel based on the second detection signal when the second detection signal is input; A second dot converter for generating a third corrected grayscale value by decreasing the selected grayscale value may be included.

In this case, the first correction grayscale value and the second correction grayscale value may be equal to each other.

The drawings and detailed description of the present invention referred to so far are only examples of the present invention, which are only used for the purpose of explaining the present invention, but are used to limit the scope of the present invention described in the meaning or claims. It is not. Therefore, those skilled in the art will understand that various modifications and equivalent other embodiments are possible therefrom. Therefore, the true technical protection scope of the present invention should be determined by the technical spirit of the appended claims.

9: Processor
10: display device
11: timing control unit
12: data driving unit
13: scan drive unit
14: pixel part
15: gradation corrector
DT1: first dot
PX1: first pixel
PX2: second pixel
PX3: third pixel

Claims (25)

It includes a first pixel, a second pixel, and a third pixel, the third pixel is located in a first direction from the first pixel and the second pixel, the first pixel is located in the first direction from the second pixel a first dot located in a second direction perpendicular to the direction;
a second dot adjacent to the first dot in the first direction;
a third dot adjacent to the first dot in a direction opposite to the first direction;
a timing controller configured to receive grayscale values of the first to third dots of an image frame from an external processor;
When the first dot is determined as an edge of an object included in the image frame based on the grayscale values of the first to third dots, the first grayscale value corresponding to the first pixel and the first grayscale value corresponding to the second pixel a grayscale correction unit that generates a first and second corrected grayscale value based on the second grayscale value; and
A first data voltage corresponding to the first compensation grayscale value is supplied to the first pixel, a second data voltage corresponding to the second compensation grayscale value is supplied to the second pixel, and a third data voltage corresponding to the grayscale value is supplied. And a data driver supplying a third data voltage to the third pixel
display device. According to claim 1,
The gray level correction unit
And a first dot detector outputting a first detection signal when an edge value of the first dot calculated based on the grayscale values of the first to third dots is equal to or greater than a threshold value.
display device. According to claim 2,
The gray level correction unit
When the first detection signal is input, the first grayscale value is converted into the first corrected grayscale value, the second grayscale value is converted into the second corrected grayscale value, and the first corrected grayscale value and the first corrected grayscale value are converted. The second correction grayscale value is the same as each other, further comprising a first dot conversion unit,
display device. According to claim 3,
wherein the first dot conversion unit sets an average value of the first grayscale value and the second grayscale value as the first corrected grayscale value and the second corrected grayscale value;
display device. According to claim 3,
For the same grayscale value, the luminance of the first pixel is lower than that of the second pixel;
The first dot converter sums a value obtained by applying a first weight to the first grayscale value and a value obtained by applying a second weight to the second grayscale value, and sets the first corrected grayscale value and the second corrected grayscale value, ,
The first weight is less than the second weight,
display device. According to claim 3,
For the same grayscale value, the luminance of the first pixel is higher than that of the second pixel;
The first dot converter sums a value obtained by applying a first weight to the first grayscale value and a value obtained by applying a second weight to the second grayscale value, and sets the first corrected grayscale value and the second corrected grayscale value, ,
The first weight is greater than the second weight,
display device. According to claim 4,
It includes a fourth pixel, a fifth pixel, and a sixth pixel, the sixth pixel is located in a first direction from the fourth pixel and the fifth pixel, and the fourth pixel is located in a second direction from the fifth pixel a fourth dot located at;
a fifth dot adjacent to the fourth dot in the second direction; and
Further comprising a sixth dot adjacent to the fourth dot in a direction opposite to the second direction,
The timing controller receives grayscale values of the fourth to sixth dots of the image frame from the processor;
The gray level correction unit
A second dot detector configured to output a second detection signal when the fourth dot is determined to be a dot adjacent to an edge of an object included in the image frame based on grayscale values of the fourth to sixth dots. doing,
display device. According to claim 7,
The gray level correction unit
When the second detection signal is input, one of a fourth grayscale value corresponding to the fourth pixel and a fifth grayscale value corresponding to the fifth pixel is selected based on the second detection signal, and the selected grayscale value is selected. Further comprising a second dot converter for generating a third corrected grayscale value by decreasing the value,
display device. According to claim 8,
When the second dot converter generates the third corrected grayscale value by decreasing the fourth grayscale value,
The data driver supplies a data voltage corresponding to the third corrected grayscale value to the fourth pixel.
display device. According to claim 9,
When the second dot converter generates the third corrected grayscale value by decreasing the fifth grayscale value,
The data driver supplies a data voltage corresponding to the third corrected grayscale value to the fifth pixel.
display device. According to claim 1,
When the first dot constitutes an edge dot of a letter in the image frame, the processor determines that the first to third grayscale values are different from each other, and the second grayscale value is the first grayscale value and the first grayscale value. Providing the first to third grayscale values so as to be between three grayscale values,
display device. According to claim 2,
The first dot detector calculates an edge value of the first dot by applying a single-row prewitt mask having the first direction as a row direction to the first to third dots,
display device. According to claim 2,
The first dot detection unit calculates an edge value of the first dot using a plurality of rows of prewit masks or Sobel masks in which the first direction is a row direction and the second direction is a column direction. doing,
display device. According to claim 2,
The gray level correction unit
When the first detection signal is input, the first grayscale value is converted into the first corrected grayscale value, the second grayscale value is converted into the second corrected grayscale value, and the first grayscale value and the first grayscale value are converted. Further comprising a first dot conversion unit in which a sum of the 2 grayscale values is equal to a sum of the first corrected grayscale value and the second corrected grayscale value.
display device. According to claim 14,
For the same grayscale value, the luminance of the first pixel is lower than that of the second pixel;
The first corrected grayscale value is higher than the second corrected grayscale value,
display device. According to claim 14,
For the same grayscale value, the luminance of the second pixel is lower than the luminance of the first pixel;
The second corrected grayscale value is higher than the first corrected grayscale value,
display device. According to claim 14,
The luminance of the first pixel corresponding to the first data voltage and the luminance of the second pixel corresponding to the second data voltage are the same.
display device. It includes a first pixel, a second pixel, and a third pixel, the first pixel is located in a first direction from the second pixel, the first pixel and the second pixel are from the third pixel to the first a first dot located in a second direction perpendicular to the direction;
a second dot adjacent to the first dot in the first direction;
a third dot adjacent to the first dot in a direction opposite to the first direction;
a timing controller configured to receive grayscale values of the first to third dots of an image frame from an external processor;
When the first dot is determined as an edge of an object included in the image frame based on the grayscale values of the first to third dots, the first grayscale value corresponding to the first pixel and the first grayscale value corresponding to the second pixel a grayscale correction unit that generates a first and second corrected grayscale value based on the second grayscale value; and
A first data voltage corresponding to the first compensation grayscale value is supplied to the first pixel, a second data voltage corresponding to the second compensation grayscale value is supplied to the second pixel, and a third data voltage corresponding to the grayscale value is supplied. And a data driver supplying a third data voltage to the third pixel
display device. According to claim 18,
The gray level correction unit
And a first dot detector outputting a first detection signal when an edge value of the first dot calculated based on the grayscale values of the first to third dots is equal to or greater than a threshold value.
display device. According to claim 19,
The gray level correction unit
When the first detection signal is input, the first grayscale value is converted into the first corrected grayscale value, the second grayscale value is converted into the second corrected grayscale value, and the first corrected grayscale value and the first corrected grayscale value are converted. The second correction grayscale value is the same as each other, further comprising a first dot conversion unit,
display device. delete delete delete delete delete

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